Rebecca Adlington's fiancé has taken to Twitter to deny rumours that his future wife is pregnant.

"I can honestly say hand on heart, she's not," the Olympic swimmer's beau Harry Needs wrote while the Olympic double gold medallist competes on I'm A Celebrity.... "Unless something went on in the jungle without me? #TeamAdlo"

Rumours began to swirl when the 24-year-old was exempted from some trials due to an unknown "medical condition".

Harry, who will tie the knot with Rebecca next September, has now flown to Australia to be there to welcome his fiancée when she leaves the jungle.